package edu.xhu.gateway.filters;

import edu.xhu.utils.common.AppJwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
@Slf4j
public class AuthorizeFilter implements Ordered, GlobalFilter {


    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        // 1.获取request和response
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();

        // 2.判断是否是登录请求,是则放行
        if (request.getURI().getPath().contains("/biliuser") || request.getURI().getPath().contains("/homepage")|| request.getURI().getPath().contains("/bilivideo")|| request.getURI().getPath().contains("/behavior")|| request.getURI().getPath().contains("/bilisearch")) {
            return chain.filter(exchange);
        }
        // 3.判断token是否存在
        String token = request.getHeaders().getFirst("token");
        if (StringUtils.isBlank(token)) {
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        // 4.判断token是否有效
        try {
            Claims claimsBody = AppJwtUtil.getClaimsBody(token);
            //是否过期
            int verifyToken = AppJwtUtil.verifyToken(claimsBody);
            if (verifyToken == 1 || verifyToken == 2) {
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }
            //获取用户信息
            Object userId = claimsBody.get("id");

            //存储header中
            ServerHttpRequest serverHttpRequest = request.mutate().headers(httpHeaders -> {
                httpHeaders.add("userId", String.valueOf(userId));
            }).build();

            //重置请求
            exchange.mutate().request(serverHttpRequest);
        } catch (Exception e) {
            log.error("exception message", e);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        // 5.放行
        return chain.filter(exchange);
    }

    /**
     * 优先级设置，值越小，优先级越高
     */
    @Override
    public int getOrder() {
        return 0;
    }
}
